Electric current concise physics class 10 icse

Question 1

What is electric current?

Answer 1

Electric current is the flow of electric charge in a conductor.

Question 2

What is the SI unit of electric current?

Answer 2

The SI unit of electric current is the Ampere (A).

Question 3

True or False: Electric current can flow through an insulator.

Answer 3

False.

Question 4

What is the formula for calculating electric current?

Answer 4

The formula is I = Q/t, where I is current, Q is charge, and t is time.

Question 5

Fill in the blank: The flow of current is measured in __________.

Answer 5

Amperes.

Question 6

What are the two types of electric current?

Answer 6

The two types of electric current are direct current (DC) and alternating current (AC).

Question 7

Which type of current flows in one direction?

Answer 7

Direct current (DC) flows in one direction.

Question 8

What is alternating current (AC)?

Answer 8

Alternating current (AC) is the flow of electric charge that changes direction periodically.

Question 9

What instrument is used to measure electric current?

Answer 9

An ammeter is used to measure electric current.

Question 10

True or False: Current can exist without a closed circuit.

Answer 10

False.

Question 11

What does the symbol ‘I’ represent in electrical formulas?

Answer 11

The symbol ‘I’ represents electric current.

Question 12

What is the role of a conductor in electric current?

Answer 12

A conductor allows electric current to flow through it.

Question 13

Fill in the blank: In a series circuit, the current __________ through each component.

Answer 13

is the same.

Question 14

What happens to the total current in a parallel circuit?

Answer 14

The total current is the sum of the currents through each parallel branch.

Question 15

What is the relationship between voltage, current, and resistance?

Answer 15

According to Ohm’s Law, V = I × R, where V is voltage, I is current, and R is resistance.

Question 16

What is the unit of measurement for electric charge?

Answer 16

The unit of measurement for electric charge is Coulomb (C).

Question 17

True or False: Increasing the resistance in a circuit decreases the current.

Answer 17

True.

Question 18

What is the effect of temperature on the resistance of a conductor?

Answer 18

As temperature increases, the resistance of a conductor typically increases.

Question 19

Fill in the blank: The flow of electrons constitutes __________.

Answer 19

electric current.

Question 20

What type of circuit has only one path for current flow?

Answer 20

A series circuit.

Question 21

What type of circuit allows multiple paths for current flow?

Answer 21

A parallel circuit.

Question 22

What is a short circuit?

Answer 22

A short circuit is an unintended path of low resistance that allows excessive current to flow.

Question 23

What is the function of a fuse in an electric circuit?

Answer 23

A fuse protects the circuit by breaking the connection if the current exceeds a safe level.

Question 24

True or False: A battery provides alternating current.

Answer 24

False.

Question 25

What does a voltmeter measure?

Answer 25

A voltmeter measures the voltage across two points in a circuit.

Question 26

What is the relationship between current and voltage in a conductor at constant temperature?

Answer 26

They are directly proportional to each other.

Question 27

Fill in the blank: The total resistance in a series circuit is __________.

Answer 27

the sum of individual resistances.

Question 28

What is a common source of direct current?

Answer 28

Batteries are a common source of direct current.

Question 29

What is the primary source of alternating current in homes?

Answer 29

The electrical grid provides alternating current.

Question 30

True or False: Current is independent of the voltage applied in a circuit.

Answer 30

False.

Question 31

What does it mean when current is described as 'steady'?

Answer 31

It means the current remains constant over time.

Question 32

What is the principle of conservation of charge?

Answer 32

The principle states that electric charge can neither be created nor destroyed.

Question 33

Fill in the blank: In a parallel circuit, the voltage across each component __________.

Answer 33

is the same.

Question 34

What is Kirchhoff's Current Law?

Answer 34

It states that the total current entering a junction equals the total current leaving the junction.

Question 35

What is the effect of adding more resistors in series on total resistance?

Answer 35

The total resistance increases.

Question 36

What does a current-carrying conductor produce?

Answer 36

A magnetic field.

Question 37

Fill in the blank: The __________ is the flow of charge carriers.

Answer 37

electric current.

Question 38

What is the difference between conventional current and electron flow?

Answer 38

Conventional current flows from positive to negative, while electron flow is from negative to positive.

Question 39

True or False: All materials can conduct electric current.

Answer 39

False.

Question 40

What is the main factor affecting the resistance of a conductor?

Answer 40

The material of the conductor.

Question 41

What can increase the current in a circuit?

Answer 41

Increasing the voltage or decreasing the resistance.

Question 42

Fill in the blank: The __________ of a circuit determines how current flows.

Answer 42

configuration.

Question 43

What is the purpose of a circuit breaker?

Answer 43

A circuit breaker automatically interrupts the flow of current to prevent overload.

Question 44

What happens to the current if the resistance is halved while voltage remains constant?

Answer 44

The current doubles.

Question 45

Fill in the blank: The __________ is the opposition to the flow of current.

Answer 45

resistance.

Question 46

What are semiconductors?

Answer 46

Materials that have conductivity between conductors and insulators.